Drilling apparatus



May 5, 1936.

E. G. GARTIN DRILLING APPARATUS Filed May 29, 1933 Leven 019: E61/e621; y. 6fm@ fa/L.

Patented May 5, 1936 UNITED STATES PATENT OFFICE DRILLING APPARATUS Elmer G. Gartin, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation f Massachusetts Application May 29, 1933, Serial No. 673,489

6 Claims.

This invention relates to feeding mechanism, and more particularly to improvements n feeding mechanism for a hammer rock drill.

An object of this invention is to provide an improved rock drill feeding mechanism. Another object is to provide an improved rock drill feeding mechanism wherein the feeding elements are operated by power from a moving part of the rock drill. Still another object is to provide an improved rock drill feeding mechanism wherein the feeding elements are actuated by power by the drill steel rotation means of such a drill. A further object is to provide an improved feeding means operable independently of the means for feeding the drill during drilling for rapidly moving the drill into spotting position. Another object of this invention is to provide an improved feeding mechanism for a drifter type rock drill for moving the drill into spotting position at a rapid speed and independently of the usual manual feed of such a drill. Yet another object is to provide a plurality vof independently operable feeding devices for a drifter type rock drill whereby the drill may be fed by its usual manual feeding means at a relatively slow `drilling speed or at a relatively high positioning speed by means actuated by power. Yet another object is to provide an improved power operated reversible feeding mechanism for a drifter type '30 rock drill. These and other objects and advantages of the invention will, however, .hereinafter more fully appear.

In the accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

In this drawing,-

Fig. l is a longitudinal vertical sectional View through a drifter type rock drill having embodied therein the illustrative form of the improved feeding mechanism.

Fig. 2 is a cross sectional View taken substantially on line 2-2 of Fig. 1.

Fig. 3 is an enlarged detail sectional view showing the improved feed driving and reversing| mechanism.

Fig. 4.- is a detail sectional view taken substantially on line 4-4 of Fig. 3.

Fig. 5 is a detail view showing the reverse handle lock.

In this illustrative embodiment of the invention there is shown a drifter type rock drill generally designated I mounted on a guide shell 2. The rock drill is generally of a standard design and comprises a uid actuated motor including a f cylinder 3 having a bore 4 containing a reciprocable hammer piston 5. The drill cylinder ls provided externally thereon with the usual laterally projecting longitudinal guides 6, 6 engaging usual longitudinal guideways 1, 'I formed on the guide shell. Carried within a boss 8 projecting downwardly between the shell guideways is a non-rotatable feed nut 9 having internal threads engaging a rotatable feed screw III journaled in a usual manner at II on the guide shell and having a usual manual operating handle I2. Suitably secured to the front end of the drill cylinder is a chuck housing I3 having rotatably mounted therein a chuck sleeve I4 carrying a chuck bushing I5 for receiving a lugged shank I9 of a usual drill steel Il. As the hammer piston 5 reciprocates Within the cylinder it effects intermittent rotative movement of the drill steel and the means for rotating the steel comprises a ratchet and pawl mechanism I8 of a usual design having a forwardly projecting rifle bar I9 engaging a rifle nut secured within the hammer piston. The forwardlyvextending striking bar 20 of the hammer piston 5 which transmits blows to the shank of the drill steel to actuate percussively the latter is provided with longitudinal grooves 2l engaging straight keys formed on a chuck nut 22 secured within the chuck sleeve I4. Clutched at 23 to the chuck sleeve is a driver member 24 having lugs engaging the lugs 0f the drill steel, so that when the sleeve I4 is rotated, the drill steel rotates therewith. As the hammer piston 5 moves forwardly, the pawls of the ratchet mechanism slip over the ratchet teeth to permit the hammer piston to deliver an unimpeded blow to the drill steel shank. Upon reversal of the hammer piston the pawls of the ratchet mechanism prevent rotation of the rifle bar I9, and as a result, the hammer piston is given a rotative movement as it moves rearwardly, and this rotative movement is transmitted through the straight grooves 2| and the keys of the chuck nut 22 to the chuck sleeve I4 and driver member 24 thereby to rotate the drill steel. As the mechanism described above is of a standard design, and is usual in rock drills of the drifter type, further description thereof is considered unnecessary other than to state that as the operator grasps the handle I2 to rotate manually the feed screw I0, the rock drill is fed longitudinally along itsl guideways on the guide shell thereby to feed the drill steel forwardly as the latter is percussively actuated by the hammer motor.

Now referring to the improved feeding mechanism, it will be noted that formed on the exterior periphery of the rotating chuck sleeve I4 is an annular friction ring or friction gear 25 with which frictionally engages for rotation thereby a friction wheel or gear 26 journaled on a longitudinal shaft 21 arranged parallel with the longitudinal axis of the rock drill motor and suitably joul'naled within a casing 28 formed integral with the chuck housing I3. Also journaled within the casing 28 and surrounding the feed screw is a friction wheel or gear 29 having formed therein a key 30 slidably engaging a longitudinal keyway 3| formed along the length of the feed screw I3. Also journaled on a shaft 32 arranged parallel with the shaft 2'I and the feed screw and movably mounted in a chamber 33 formed in the casing 28 is a friction wheel or gear 34. As shown in Fig. 4, the ends of the shaft 32 are mounted for sliding movement in inclined slots 35, 35 formed in the opposite sides of the casing 28 so that when the shaft 32 is slid upwardly along the inclined slots the friction wheel 34 is moved into frictional engagement with the friction ring 25 on the chuck sleeve and the friction wheel 29. When the shaft 32 is moved downwardly to the bottom of the slots 35 the friction wheel 34 is brought into frictional engagement with the friction wheels 26 and 29. It will thus be seen that the friction wheel 29 may be driven in either of opposite directions, depending upon the position of the friction wheel 34; the friction wheel 29 being driven in one direction when the friction wheel 34 is in one position from the friction ring 25 through the friction wheels 26, 34, and when the friction wheel 34 is in its opposite position, the friction wheel 29 is driven in the opposite direction from the friction ring 25 directly by the friction wheel 34. It will thus be seen that the friction wheel 34 and the inclined slotted mounting for the shaft 32 whereby the friction wheel is movable into engagement with either the friction ring or the friction Wheel 26 constitutes a reversing mechanism. The means for shifting the friction wheel 34 into its opposite driving positions comprises a bracket 38 having a vertical slot 31 in which the shaft 32 is mounted, and this bracket is formed on a transversely reciprocable operating rod 38 slidably mounted in a bore 39 formed in the casing 28. This operating rod has formed on its outer extremity an operating handle 40 conveniently located at the forward end of the drill. As shown in Fig. 5, mounted within the operating rod 38 is a spring pressed plunger lock 4I selectively engageable with three notches 42, 43 and 44 formed in the wall of the bore 39, and this plunger lock maintains the friction wheel 34 in its opposite reversing positions and its intermediate inoperative or neutral position.

From the foregoing description the operation of the improved drill feeding mechanism will be clearly apparent. As the drill steel Il is percussively actuated by the hammer piston 5, it is at the same time intermittently rotated through the rotating sleeve I4 operated by the piston actuated ratchet and pawl mechanism. As the drill steel is intermittently rotated by the chuck sleeve the friction ring 25 is simultaneously rotated. When the friction wheel 34 is in the position shown in Fig. 3 in frictional driving engagement with the slip relative to each other to interrupt the drive while operation of the hammer piston and steel rotation continues. After the rock drill has been moved into spotting position, the operator grasps the handle 40 and moves the friction wheel 34 into its intermediate inoperative position out of driving engagement with the friction wheels 25 and 26. The operator then grasps the handle I2 of the manual feed and manually rotates the feed screw to effect forward feed of the rock drill along the guide shell at a relatively slow drilling speed. When the drill hole is completed, or if it is desired to change drill steels, the rock drill may be fed rapidly in a rearward direction, and to effect this function the operator grasps the handle 49 and shifts the friction wheel 34 into the reversing position Shown in Fig. 2 in driving engagement with the friction ring 25 and the friction wheel 29. The direction of rotation of the feed screw is then reversed while the drill steel rotation means operates in the same direction, and as a result the screw I0 is rotated relative to the feed nut 9 in a direction to effect rapid feed of the rock drill in a rearward direction along the guide shell. When the extreme limit of rearward noted that under certain conditions the improved power operated feeding mechanism may be utilized to eifect forward feed of the rock drill on the guide shell during the drilling operation, for instance when the drill steel is penetrating a relatively soft substance and a rapid feed is possible.

As a result of this invention it will be noted that an improved feeding mechanism is provided for a rock drillowhereby the rock drill may be fed in its spotting position in an improved manner. It will further be noted that by the provision of the feeding mechanism for positioning the rock drill it is possible to move the rock drill at a high speed along the guide shell by means operated by power from the hammer motor,

said means being reversible at will to effect feed of the drill at a high positioning speed in either direction along the guide shell. These and other advantages of the improved feeding mechanism will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In combination, a hammer rock drill comprising a cylinder containing a reciprocatory hammer piston for delivering impact blows to the shank of a drill steel, a guide shell having longitudinal guideways on which the rock drill is slidably guided, mechanism for effecting intermittent rotary motion of said hammer piston as the latter reciprocates within said cylinder, a chuck mechanism for supporting the drill steel shank in position to receive the impact blows of said hammer piston annd having an interlocking connection with said piston whereby when said piston is intermittently rotated the drill steel is intermittently rotated through said chuck mechanism, and mechanism operated by a rotary element of said chuck mechanism for effecting intermittent feed of the rock drill along the shell guideways.

2. In combination, a hammer rock drill comprising a cylinder containing a reciprocatory hammer piston for delivering impact blows to the shank of a drill steel, a guide shell having longitudinal guideways on which the rock drill is slidably guided, mechanism for effecting intermittent rotary motion of said hammer piston as the latter reciprocates within said cylinder, a chuck mechanism for supporting the drill steel shank in position to receive the impact blo-Ws of said hammer piston and having an interlocking connection with said piston whereby when said piston is intermittently rotated the drill steel is intermittently rotated through said chuck mechanism, and mechanism operated by a rotary element of said chuck mechanism for effecting intermittent feed of the rock drill along the shell guideways and having embodied therein reversing gearing whereby the rock drill may be fed in either of opposite directions along the shell guideways while said chuck element intermittently rotates always in the same direction.

3. In combination, a hammer rock drill comprising a cylinder containing a reciprocable hammer piston for delivering impact blows to the shank of a drill steel, a guide shell having longitudinal guideways on which the drill is slidably guided, a ratchet and pawl mechanism for effecting intermittent rotational movement of said hammer piston, a chuck mechanism for supporting the drill steel shank in position to receive the impact blows of said hammer piston, an interlocking connection between said piston and said chuck mechanism whereby when said piston is rotated rotary motion is transmitted through said chuck mechanism to the drill steel, and mechanism operated by a rotary element of said chuck mechanism for effecting intermittent feed of the rock drill along the shell guideways.

4. In combination, a hammer rock drill cornprising a cylinder containing a reciprocable hammer piston for delivering impact blows to the shank of a drill steel, a guide shell having longitudinal guideways on which the drill is slidably guided, a ratchet and pawl mechanism for effecting intermittent rotational movement of said hammer piston, a` chuck mechanism for supporting the drill steel shank in position to receive the impact blows of said hammer piston, an interlocking connection between said piston and said chuck mechanism whereby when said piston is rotated rotary motion is transmitted through said chuck mechanism to the drill steel, and mechanism operated by a rotary element of said chuck mechanism for effecting intermittent feed of the rock drill along the shell guideways and having embodied therein reversing gearing whereby the drill may be fed in either of opposite directions along the shell guideways while said chuck element rotates always in the same direction.

5. In combination, a hammer rock drill comprising a cylinder containing a reciprocatory hammer piston for delivering impact blows to the shank of a drill steel and having frontand rear heads, a guide shell having longitudinal guideways on which the rock drill is slidably guided, a ratchet and pawl controlled rifle bar arranged at the rear end of said cylinder and having a spiral groove interlocking connection with said hammer piston, a chuck mechanism arranged at the front end of said cylinder for supporting the steel shank in position to receive the impact blows of said piston and having a sliding interlocking connection with said piston whereby when the latter is intermittently rotated by said ratchet and pawl controlled rifle bar the drill steel is intermittently rotated by said piston through said chuck mechanism, a feed screw mounted on and extending longitudinally of said guide shell, a feed nut engaging said feed screw and mounted on said drill, and means arranged at the forward end of the drill and operated by a rotary element of said chuck mechanism for effecting intermittent rotation of said feed screw thereby to effect feed of the rock drill along the shell guideways.

6. In combination, a hammer rock drill comprising a cylinder containing a reciprocatory hammer piston for delivering impact blows to the shank of a drill steel and having front and rear heads, a guide shell having longitudinal guideways on which the rock drill is slidably guided, a ratchet and pawl controlled rifle bar arranged at the rear end of said cylinder and having a spiral groove interlocking connection with said hammer piston, a chuck mechanism arranged at the front end of said cylinder for supporting the steel shank in position to receive the impact blows of said piston and having a sliding inter- 'locking connection with said piston whereby when the latter is intermittently rotated by said ratchet and pawl controlled rifle bar the drill steel is intermittently rotated by said piston through said chuck mechanism, a feed screw mounted on and extending longitudinally of said guide shell, a feed nut engaging said feed screw and mounted on said drill, and means arranged at the forward end of the drill and operated by a rotary element of said chuck mechanism for effecting intermittent rotation of said feed screw thereby to effect feed of the rock drill along the shell guideways and having embodied therein reversing gearing whereby the feed screw may be rotated to effect feed of the drill in either of opposite directions along the shell guideways while said chuck element rotates always in the K same direction.

ELMER G. GARTIN. 

